Reducing-valve.



C. N. SOWDEN.

EnucmG vALvE. APPLICATION'FILEDIUIIEZM1916.

1 ,2 1 6,872. Patented Feb. 20, 1917.

2 SHEETS-SHEET 2.

Fgi# WTNESSES INI/ENTUR fran siarns PATENT orare CHARLES NEVILLE SOWDEN, OF TORONTO, ONTARIO, CANADA.

REDUoInG-vnnvn.

Application lled June 24, 1916.

To all fwwm it may concern Beit known that l, CHARLES NnvILLn Sow-l ducing pressure for evaporating purposes should be in proportion to the initial pressure used for power purposes.

An object of the invention is to provide a simple, inexpensive and eflicient reducing valve.

A further object of the invention is to reduce the pressure automatically and without excessive shocks.

With the above and other objects in View, the nature of which will more Jrully appear as the description proceeds, the invention consists in the novel construction, combination and arrangement of parts as herein fully described, illustrated and claimed.

In the accompanying drawings, forming part of the application, similar characters of reference indicate corresponding parts in all the views. y

Figure 1 is a vertical section of a vacuum reducing valve embodying my invention;

Fig. 2 is a similar section of a pressure reducing valve for pressures above the atmospheric pressure; and

Fig. 3 is a. horizontal section on line 3 3, Fig. 1.

Referring to the drawings, 4 is a valve casing the partition wall 5 of whichhas a threaded bore 6. A sleeve 7 is threaded into the bore. The sleeve has apertures 8 on one A piston valvey side of the partition wall. l 9 fits snugly into the sleeve 7. The -sleeve 7 has an interior annular shoulder 10 below the openings 8 which forms a. stop for the piston valve 9. rlhis shoulder carries a fluid in a groove 11 to eliminate chattering.

A piston 12 in rigidconnection with theV piston valve 9 lits snugly into a cylindrical chamber 13 provided in a valve head 14 which is secured to the valve casing. The

piston 12 has a rod 15 which is connected to a lever 16 by a link 17. The lever is fulcruined on a bracket 18 extending from the Specification of Letters Patent. Patented Feb, 20, 1917,

Serial No. 105,571.

valve head 14X An adjustable weight 19 is provided on the lever 16 between the fulcrum and link 17. If a cylinder cap 20 is used to protect the piston 12, a vent 21 sho-nld be provided in the cap.

Fig. `1 shows the valve 9 closed. The in- 'itial vacuum formed in the chamber A ot the valve casing will raise the piston valve 9 and piston 12 against atmospheric pressure on the piston 12 and establish communicationlbetween the chambers A and B of the .valve casing. The piston valve 9 is held in raised position by the vacuum in chambers A and B to give the proportional reduction. The vacuum in chamber A timos-the dit ference in area between the piston valve 9 and the piston 12 equals the vacuum in chamber B times the area of the piston valve 9. `By means of the weight 19 the vacuum in chamber B 'may be varied to be more or less than that which the' valve is calculated to give. A'It will be seen that the vacuum in chamber B will vary in exact proportion to the variation of the vacuum in the chamber A.

It the valve is to be used for pressures above atmospheric and the flow is from the chamber A to chamber B (see Fig. 2) the sleeve 7 is threaded into the partition 5 so that lthe openings 8 are within the chamber B', the piston valve 9 separating the openings from the chamber A. j The piston 12 is rigid with the piston valve 9 and fits snugly into the cylindrical chamber formed in the head 111 of the valve. A vent 21 is provided in the head to subject the upper surface Vof the .piston to atmospheric pressure.

l ln Fig. 2 the piston valve 9 is shown closed. V`The initial pressure is in chamber A and it will force the piston valve from its seat when the pressure in A times the difference in Varea between the pistonvalve 9. and the piston 12 equals the pressure in chamber B- times the area of the piston valve 9. The pistonvalve will be held in the displaced position by the pressure in the chambers A and B andmaintain the differ ence in pressure. Any variation in pressure in chamber A will vary the pressure in chamber B in exact proportion.l A weight can also be appliedv to this valve structure if so desired.

'l claim: Y

1. A reducing valve comprising in combination a Valve casing having 'a partition wall, an apertured sleeve threaded into the partition wall so that the apertures are wholly on one side of the partition, a piston valve in the sleeve controlling the communif cation between the two sides of the partition wall, said sleeve having a shoulder forming an additional seat for said valve at the closed positioma valve head having a cylindrical chamber in communication with the valve casing on one side of the partition and also with. the atmosphere, and a piston in the chamber separating the communication of the chamber with the casing trom that of the chamber with the atmosphere, said pieton being in rigid connection with said piston valve to participate in all the movements of said piston valve.

2. 'redueing valve comprising in combi- .nation a. valve casing having a partition wall presenting a threaded bore, an apertured YSleeve threaded into the bore. of the partition Copies of this patent may be obtained for five cents each, by addressing the Gommissoner of Patents, l

so that the apertures are wholly on one side of the partition, a piston valve in the sleeve controlling the communication between the two Sides of the partition, Said sleeve having a shoulder forming an additional seat for said valve at its closing position, a valve head having a cylindrical chamber in communication with the valve casing on one side of the partition and also with the atmosphere, a piston in said chamber separating the con'imunication of the chamber with the casing from that oit the chamber with the atmosphere, Saidpiston being of smalier diameter than the piston valveA and in rigid connection therewith to participate in the movement oia the valve, and an adjustable weight associated with the piston Jfor varying the pressure thereupon substantially as and for the purpose set forth.

n GH ARLES NEVLLE SOVDN.

Washington, I). C. 

